In a book I am reading I see the following:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]m(B_n) \uparrow m(A)\quad \textrm{if}\, B_1 \subset B_2 \subset \dots\, \textrm{and}\, \bigcup_{n=1}^{\infty} B_n = A[/tex]

What does the up arrow signify? m(A) denotes the lebesgue measure of A if that helps.

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# A question of notation

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